1 0 0 0 OA NPPV 鼻マスクのフィッティングにおける力学的検討
- 著者
- 尾田 雅文 二宮 敬一 原 利昭
- 出版者
- ライフサポート学会
- 雑誌
- ライフサポート (ISSN:13419455)
- 巻号頁・発行日
- vol.25, no.4, pp.124-129, 2013-12-30 (Released:2015-02-09)
- 参考文献数
- 10
- 被引用文献数
- 1 2
The number of patients with chronic respiratory deficiency, such as Chronic Obstructive Pulmonary Disease or Sleep Apnea syndrome, is increasing. For patients with comparatively serious symptoms, the Non-invasive Positive Pressure Ventilation (NPPV) may be prescribed. However, pressure necrosis or anaclisis could affect treatment by occurring at the contact area of nasal mask. In response to this problem, the construction of a simulation environment can be applied. This personal simulation model was created based on these measurement results and the interpolation results using the Free-form-deformation technique. A fundamental numerical analysis was performed, and Von Mises stress distribution was shown when the NPPV nasal mask made contact with the face. It is shown that the maximum stress can be decreased by 19.4% compared with the cases of standard mask. In conclusion, by using this system, the shape of a nasal mask suitable for each patient can be determined.
1 0 0 0 OA 大腿骨転子下骨折におけるストレッチ運動が骨折部位に与える生体力学的影響
- 著者
- 野口 愛子 笹川 圭右 尾田 雅文 塩田 直史 佐藤 徹 原 利昭
- 出版者
- ライフサポート学会
- 雑誌
- ライフサポート (ISSN:13419455)
- 巻号頁・発行日
- vol.29, no.3, pp.100-105, 2017-06-30 (Released:2019-03-29)
- 参考文献数
- 19
The biomechanical effects of an intramedullary nail system for treating subtrochanteric fracture during bone healing is still unclear. The aim of this study was to analyze the stress conditions of a subtrochanteric fracture model implanted with an intramedullary nail system and augmentation plate under stretching exercise. Two displacement conditions assuming stretching exercise were considered. The finite element (FE) model of a subject undergoing surgery with the intramedullary nail system and augmentation plate was constructed based on post-operative computed tomography images. A 1-mm-thick callus was set in the gaps positioned at the fracture line. Bone healing was defined as a change in the Young's modulus of the callus. The orced displacements from the medial and lateral sides were applied to the distal part of the FE model, respectively. In the initial stage of bone healing, there was a noticeable difference between stress distributions of the callus under displacements from the medial and lateral sides. The compressive stress was widely distributed in the callus by the displacement from the lateral side. However, the tensional stress in the callus was increased by displacement from the medial side. Stretching exercise, such as displacement from medial direction, carries a risk of non-union.